Feb 13, 2009 10:23 PM|darkknight187|LINK
The biggest question is, are all users signed up as Admin?
Or is it that your admin section is allowing everyone?
Can you paste www.yoursite.com/Admin/Default.aspx
without logging in at all and view the admin area.
Since you have been there before make sure you hit refresh to make sure it really is letting you in.
Does it force a loggin?